Until early 1950s, the Public Switched Telecommunication Network (PSTN) had evolved to support voice communication. At the same time data transmission was limited to teletypewriter information exchange at 10 characters/second corresponding to 50 bits/second.

Symbolic substitution is being considered for use in several optical processing architectures. To identify the strengths and weaknesses of symbolic substitution, a typical application (SIMD binary addition) is chosen, and system requirements are derived from this application. System level performance is then defined in terms of these requirements, and it ...

The degree of squeezing generated by parametric-down-conversion or four-wave-mixing can be limited by the ratio of the nonlinear coupling to the linear losses in many practical systems. This ratio can be enhanced by increasing the pump power used for the nonlinear coupling in many solid nonlinear systems where the linear ...

Materials and processes used for high functionality hybrid circuit packages based on ceramic substrates are described. Emphasis is on hybrid circuits used for telecommunications and related applications. ;

Clear evidence for cocrystallization within the same lattice in polymer systems has been found in mixtures of ferroelectric random copolymers of vinylidene fluoride (VF 2ub 2) and trifluoroethylene (F sub 3 E).

This paper will review some of the possible photonics technologies that could become an important component of future telecommunications systems. It will begin by dividing photonic devices and systems into two classes according to the function they perform. The first class, relational, will be associated with devices which under external ...

We present far-induced reflectivity spectra of seven samples of ceramic superconductors in the Ba-Y-Cu-O system with transition temperatures near 93K. We find superconducting gas structures on the basis of which we estimate the ratio of twice the average gap to the transition temperature to be consistent with 3.5, but possibly ...

Recent advances in the synthesis of superconducting cuprates, such as Ba sub 2 YCu sub 3 O sub 7, have profound scientific and technological implications which have only begun to be explored. This talk will focus on current results regarding the occurrence of high-transition- temperature superconductivity, the physical properties of ...

We present far-induced reflectivity spectra of seven samples of ceramic superconductors in the Ba-Y-Cu-O system with transition temperatures near 93K. We find superconducting gas structures on the basis of which we estimate the ratio of twice the average gap to the transition temperature to be consistent with 3.5, but possibly ...

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